The constructors must install an alarm for security.
An alarm for security must be installed.
The students can easily solve the problem.
The problem can be easily solved by the students.
You can take money out of a cash machine.
Money can be taken out of a cash machine.
People must wear seatbelts during take-off and landing.
Seatbelts must be worn during take-off and landing.
We can't eat sushi from the streets.
Sushi from the streets can't be eaten.
We can keep the library book for two weeks.
The library book can be kept for two weeks.
We must fill in the form at the reception on arrival.
The form must be filled in at the reception on arrival.
We must wear headlamps in dark caves.
Headlamps must be worn in dark caves.
We mustn'n enter dangerous places alone.
Dangerous places mustn’t be entered alone.
We have to study new species in a science lab.
New species have to be studied in a science lab.
We can't analyse them underwater.
They can’t be analysed underwater.
